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प्रश्न
Using trigonometric tables, find the approximate value of cos 54° 26'.
योग
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उत्तर
Given: cos 54° 26'
Step-wise calculation:
1. Use the identity cos θ = sin (90° – θ).
So, cos 54° 26' = sin (90° – 54° 26')
= sin 35° 34'
2. Read the value of sin 35° 34' from trigonometric tables.
From the tables,
sin 35° 34' ≈ 0.5816.
cos 54° 26' ≈ 0.5816.
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